update polymer js to 0.4.0

pkg/polymer/lib/src/declaration.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of polymer;
 
 /// *Warning* this class is experimental and subject to change.
 ///
 /// The data associated with a polymer-element declaration, if it is backed
 /// by a Dart class instead of a JavaScript prototype.
@@ skipping 141 matching lines @@
   Element fetchTemplate() => element.querySelector('template');
 
   void installBindingDelegate(Element template) {
     if (template != null) {
       templateBind(template).bindingDelegate = this.syntax;
     }
   }
 
   // from declaration/path.js
   void resolveElementPaths(Node node) {
-    if (_Platform == null) return;
-    _Platform['urlResolver'].callMethod('resolveDom', [node]);
+    if (_Polymer == null) return;
+    _Polymer['urlResolver'].callMethod('resolveDom', [node]);
   }
 
   // Dart note: renamed from "addResolvePathApi".
   void initResolvePath() {
     // let assetpath attribute modify the resolve path
     var assetPath = element.attributes['assetpath'];
     if (assetPath == null) assetPath = '';
     var base = Uri.parse(element.ownerDocument.baseUri);
     _rootUri = base.resolve(assetPath);
   }
@@ skipping 372 matching lines @@
 bool _isObserverMethod(Symbol symbol) {
   String name = smoke.symbolToName(symbol);
   if (name == null) return false;
   return name.endsWith('Changed') && name != 'attributeChanged';
 }
 
 
 final _ATTRIBUTES_REGEX = new RegExp(r'\s|,');
 
 final JsObject _Platform = js.context['Platform'];
+final JsObject _Polymer = js.context['Polymer'];